Question: What international airport is Delta Air Lines' hub?
Paraphrase: What worldwide air terminal is Delta Discuss Lines' hub?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q188920 wdt:P113 ?obj . ?obj wdt:P31 wd:Q644371 } 
Answer: Cincinnati/Northern Kentucky International Airport, Hartsfield–Jackson Atlanta International Airport, LaGuardia Airport, Salt Lake City International Airport, Detroit Metropolitan Wayne County Airport, Logan International Airport, Memphis International Airport, Minneapolis–Saint Paul International Airport, John F. Kennedy International Airport, Los Angeles International Airport, Amsterdam Airport Schiphol, Seattle–Tacoma International Airport, Narita International Airport, Paris-Charles de Gaulle Airport